[Activity log] Rework extraction of URLs from argument lists

chrome/browser/extensions/activity_log/activity_action_constants.h

Index: chrome/browser/extensions/activity_log/activity_action_constants.h
diff --git a/chrome/browser/extensions/activity_log/activity_action_constants.h b/chrome/browser/extensions/activity_log/activity_action_constants.h
index 143069d20af93bfac44b381f507302f9afaacf96..028170669c7a2396e7ad1c72faa86eb7be62d727 100644
--- a/chrome/browser/extensions/activity_log/activity_action_constants.h
+++ b/chrome/browser/extensions/activity_log/activity_action_constants.h
@@ -22,6 +22,10 @@ extern const char kActionWebRequest[];
 // recording specific data about the pages.
 extern const char kIncognitoUrl[];
 
+// A string used as a placeholder for URLs which have been removed from the
+// argument list and stored to the arg_url field.
+extern const char kArgUrlPlaceholder[];
+
 }  // namespace activity_log_constants
 
 #endif  // CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_ACTIVITY_ACTION_CONSTANTS_H_